The doors to Seisaku Watanabe's workshop cum salesroom cum clubhouse in west Tokyo's Inagi stand open to all. Waving from inside, he motions passersby to drop in, take a look, have a chat.
It's a wild space, stacked and hung with colorful go-karts in all shapes and sizes. There's even a tiny motorbike — say for 2-to-3 year old?
"I like kids to start early, when they are naturally super confident," Watanabe says, peppering his native Japanese with snippets of English. "Of course, danger is an issue, but that's why training is so important."